Cross-Check is a free daily game of attention to detail. On the left is the original list: invoice numbers, dates, times, names, amounts and codes. On the right is the copy that someone typed by hand. A few rows of the copy have one small mistake, such as two digits swapped or a 3 that became an 8. Tap every row where the copy is different. The game tells you how many mistakes there are, and a tap on a row that matches costs 10 seconds. Monday has 8 rows and 3 mistakes. Friday has 16 rows and 7.
No sign-up and nothing to install. It runs in your browser on a computer or a phone, and your progress is saved on your device.
- Tap the rows that differ. When you find a mistake, the wrong characters are marked in red, next to the right ones.
- Careful beats fast. A tap on a row that matches adds 10 seconds to your time.
- Office data. The entries look like the things people really copy: invoice numbers, order numbers, dates, meeting times, names and amounts.
- Stuck? The lightbulb points to one row with a mistake.
How to play Cross-Check
- Read the first row on the left, then the same row on the right.
- If the two sides are exactly the same, move on. If they differ, tap the row.
- Keep going until the counter shows that all mistakes are found.
- Your time is your result. Wrong taps add 10 seconds each.
What you see
| Part | What it means |
|---|---|
| Original | The entry as it should be. |
| Copy | The same entry, typed by hand. It may have one mistake. |
| Green row with a tick | A mistake you found. |
| Red characters | The characters that are wrong in the copy. |
| Mistakes found | How many you have found, next to the total. |
| Wrong taps | Rows you tapped although they match. Each one costs 10 seconds. |
Tips for checking like a professional
- Read in small groups. Compare three or four characters at a time instead of the whole entry. Long numbers hide swapped digits.
- Check the ends. Eyes skip the middle and the end of an entry. Mistakes like 68 and 86 hide there.
- Know the look-alikes. 3 and 8, 1 and 7, 5 and 6, U and V, M and N, a and o are easy to mix up.
- Say it in your head. Reading the digits silently, one by one, catches more mistakes than a glance.
- Do not trust the shape. A swapped pair keeps the same digits and the same length, so the entry looks right at first sight.
How the week gets harder
| Day | Rows | Mistakes | Kind of mistakes |
|---|---|---|---|
| Monday | 8 | 3 | One clearly wrong character, or two swapped |
| Tuesday | 10 | 4 | A few look-alike characters |
| Wednesday | 12 | 5 | More look-alikes, longer entries |
| Thursday | 14 | 6 | Look-alikes in about half of the mistakes |
| Friday | 16 | 7 | Mostly look-alikes, such as 3 and 8 |
Saturday plays like a Wednesday and Sunday like a Tuesday.
Frequently asked questions
Is Cross-Check free?
Yes. There is no account, no download and no paywall.
What kind of mistakes are there?
Only two kinds: one character replaced by another, or two neighboring characters swapped. The copy always has the same length as the original.
Can a row have two mistakes?
No. A row either matches exactly or has one mistake.
Why does a wrong tap cost time?
Because guessing would make the game pointless. The 10 seconds reward careful checking, as in real work.
Is the data real?
No. All numbers, names and amounts are made up by a program from the date.
When does the new sheet appear?
At midnight in your local time.
Can I play earlier sheets?
Yes. Open the calendar button at the top of the game and pick any day from the past eight weeks.
Does it work on a phone?
Yes. Both columns fit on a phone screen, and you tap anywhere on a row.
More to play on WiseChecker
- Browser Games: every WiseChecker game in one place.
- Clean Desk: remember the desk and find what is gone.
- No Blind Spots: place cameras so that no square is a blind spot.
- Cell Value: find the number behind every letter.
- File Pairs: turn over two cards and find the pairs.